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Sensors 2006, 6(3), 193-207; doi:10.3390/s6030193
Article

Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections

1,*  and 2
1 Direction Océanographique Spatiale, Collecte Localisation Satellites, 8-10 Rue Hermès, 31520 Ramonville St-Agne, France 2 Centre ERS d’Archivage et de Traitement, Institut Français de Recherche pour l’Exploitation de la MER/Centre de Brest, B.P. 70, 29280 Plouzané, France
* Author to whom correspondence should be addressed.
Received: 26 July 2005 / Accepted: 19 November 2005 / Published: 8 March 2006
(This article belongs to the Special Issue Satellite Altimetry: New Sensors and New Application)
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Abstract

The authors report the first results in studying the polarization anisotropy of themicrowave backscatter from nadir observations provided by Jason-1 altimeter in both Ku-and C-band. A small but clear wind direction signal for wind speeds above 6 m/s is revealed.These azimuthal variations of radar cross-section increase with increasing wind speed up to14 m/s. The signatures then level off at higher winds. These results extend, for the first time,recent theoretical improved scattering approximation, and point some similarities betweenscattering and emission mechanisms at nadir. The observed directional effect can thus beinterpreted as a signature of the curvature anisotropy of wind-generated short-scale waves.Sensitivities to both wind speed and sea state are also reported in the present analysis.
Keywords: Altimeter; radar cross section; polarization; wind direction; sea state. Altimeter; radar cross section; polarization; wind direction; sea state.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tran, N.; Chapron, B. Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections. Sensors 2006, 6, 193-207.

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